Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0f7e6cf20e508e…

MALICIOUS

PDF

64.0 KB Created: 2021-09-04 11:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50aa8f7e810c5b897308165c549277c9 SHA-1: 59541c121ac6cfb9052a8a794ab691fa3bb2fff4 SHA-256: aa0f7e6cf20e508efce0c2cb99c51f88eb4d97ede1380caf71ddb476737c4f2d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to a raw IP address, suggesting it is part of a link farm designed to redirect users to potentially malicious content. The presence of compromised CMS upload links further indicates a pattern of hosting malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6906

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://rzn-house.ru/upload/file/99633305418.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/lojidumamolijaxoke.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072866e51935---virisogofuwosemovatuxeb.pdf
    • http://longvu.vn/Images_upload/files/62021228176.pdf
    • https://cursosadistanciayonline.com/medios//files/kelekozuxanaxezo.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52b547300---nabekepupi.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/455b6b49ce09cf1a38d2bf553cd569ea/58575226182.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080292d40076---misem.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609855be36b8e---rekedix.pdf
    • http://157.230.241.115/image/upload/File/fadinezusinarupepozowemor.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/3c2526c54214f3c57f1a762942f7ec28/2281457221.pdf
    • http://dga.gr/ILC/img/file/93239700649.pdf
    • http://www.ximangsongthao.com/app/webroot/uploads/files/konejidazorog.pdf
    • https://okazdedziecko.pl/_files/Media/file/fibubitokozonoxiwi.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac4be4bb7f---kawufogalazaxev.pdf
    • https://bfull.ru/uploads/files/41094160145.pdf
    • http://hoteldarim.ir/basefile/hoteldarimir/files/53732472450.pdf
    • http://sharise.net/Uploadfiles/files/44026431434.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/21247964232.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5ed5ef2fd97f3d49a281f54ce8fd302c/kufikevefa.pdf
    • http://limuzine.md/userfiles/file/dewamadafijowosexerotowi.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/jorabosolo.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c9657f6f---30199377588.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=icssr+pdf+selection+list
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/19d4ad284cd78eee20ce71ee6b1514de/dinejexadafizasigimomowa.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 16792 bytes

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